Ruby on rails 中的冲突关联有许多多形

我正在使用has_many_polymorphs在一个网站上创建一个“收藏夹”功能，在这里多个用户可以发布故事和发表评论。我希望用户能够“喜爱”的故事和评论

class User < ActiveRecord::Base
 has_many :stories
 has_many :comments

 has_many_polymorphs :favorites, :from => [:stories, :comments]
end

class Story < ActiveRecord::Base
  belongs_to :user, :counter_cache => true
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :user, :counter_cache => true
  belongs_to :story, :counter_cache => true
end

class FavoritesUser < ActiveRecord::Base
  belongs_to :user
  belongs_to :favorite, :polymorphic => true
end

我在一篇文章中找到了关于这个错误的讨论，但它没有回答我的问题

---

这是怎么回事？我怎样才能做得更好呢？

像这样的东西怎么样

class UserFavorite < ActiveRecord::Base
  belongs_to :user
  belongs_to :favorite, :polymorphic => true
end

class User < ActiveRecord::Base
  has_many :favourite_story_items, :class_name => "UserFavourite", :conditions => "type = 'Story'"
  has_many :favourite_stories, :through => :favourite_story_items, :as => :favourite
  has_many :favourite_comment_items, :class_name => "UserFavourite", :conditions => "type = 'Comment'"
  has_many :favourite_comments, :through => :favourite_comment_items, :as => :favourite
end

class-UserFavoritetrue
结束
类用户“userfavorite”，：conditions=>“type='story'”
有很多：最喜欢的故事，：至=>：最喜欢的故事项目，：as=>：最喜欢的
有很多：收藏夹注释项，：class\u name=>“userfavorite”，：conditions=>“type='comment'”
有很多：收藏夹注释，：至=>：收藏夹注释项目，：as=>：收藏夹
结束

我在这里遇到了同样的问题：你最后做了什么？

class FavoriteStory < Story
end

class FavoriteComment < Comment
end

Could not find a valid class for :favorite_comments (tried FavoriteComment). If it's namespaced, be sure to specify it as :"module/favorite_comments" instead.

class UserFavorite < ActiveRecord::Base
  belongs_to :user
  belongs_to :favorite, :polymorphic => true
end

class User < ActiveRecord::Base
  has_many :favourite_story_items, :class_name => "UserFavourite", :conditions => "type = 'Story'"
  has_many :favourite_stories, :through => :favourite_story_items, :as => :favourite
  has_many :favourite_comment_items, :class_name => "UserFavourite", :conditions => "type = 'Comment'"
  has_many :favourite_comments, :through => :favourite_comment_items, :as => :favourite
end